Combination coolant and lubricant for cold rolling mills



NITED, STATES GFFIC FOR COLD R :1

Gr MILLS Earl D. 'Spangler, Gary, Ind. No Drawing. Application June 11, 1940,

The various proportions ofv ingredients are as follows:

Serial No. 339,919

2 Claims. (0]. 252--56) This invention relates to the cold rolling of I Per cent metals such as strip steel and, more particularly, Palm oil 1 to 50 to liquid mixtures used therein for the dual pur- Water 50 to 99 pose of cooling the rolls of the mill and lubri- Lactic acid .3 to 33% eating the workpiece therebetween. In the art 6 of rolling thin wide strips of steel in a i-high fig g figfig zg gg gig g ggzg the mill, it is of extreme importance that a satisfactory medium be employed. Per cent According to the prior art, numerous media Palm 9 15 have been employed, including mixtures of water 10 Water and oils of various types. While some of these Lactic acld media serve quite well as coolants, they tend In practice, the solution or liquid mixture is toward breaking down during the rolling operasprayed through nozzles against the surface of tion because of the high heat encountered and the working rolls and on the surface of the strip thus have little or no lubricating value. being rolled, pressure being applied by any suit- So far as I am aware, all prior art mixtures ablemeans. The solution, as it drips from the have necessitated the employment of various rolls and the work,- is collected in a sump wheremechanical means to keep the component parts in the temperature is controlled as desired by a in a fusionable state. suitable heat exchanger, the solution or mixture It is among the objects of the present invenbe ng pumped f the Sump into the circulattion to provide a mixture comprising an emulsiing y m. Sprayed on th rolls n Surface 01 fyjng agent which keeps the various and the strip being reduced, and the excess mixture Donent parts in a fusionable state at all times, f n again the sumpthus dispensing with the use of the mechanical whfle I have described one speclfic embodi' means referred to herelnbefore. merit of the invention, it will be seen that I do t wish to be limited exactly thereto since Another object is to provide a mixture which, no

S 1 t 1 p 1 1 various modifications may be made without demg as he Pmper m 8 var parting from the scope thereof, as defined in the gredients is maintained, will last indefinitely appended clamm and thereby conserve considerable expense and claim: trouble. 1. A combined coolant and lubricant for cold The foregoing and other objects will ec reduction apparatus comprising a solution of more apparent after referring to the following approximately 1% to 50% palm oil, 50% to 99% description. water and .3% to 33%% lactic acid.

- The mixture embodies palm oil, water and 3 2. A combined coolant and lubricant for cold lactic acid so combined as to act as a satisfactory reduction apparatus comprising a solution or coolant with lubricating properties effective approximately 15% palm oil, approximately without brealdng down from room temperature 83.3% water and approximately 1.7% lactic acid. to the boiling point of water.

EARL D. SPANGLER. 

